A random sample of 121 bottles of cologne showed an average

A random sample of 121 bottles of cologne showed an average content of 4 ounces. It is known that the standard deviation of the contents (i.e., of the population) is .22 ounces.

Refer to Exhibit 7-4. In this problem the 0.22 is:

A random sample of 121 bottles of cologne showed an average content of 4 ounces. It is known that the standard deviation of the contents (i.e., of the population) is .22 ounces.

Solution

0.22 is known parameter of population, rather than a statistic derived from sample. so correct answer is:

d. a parameter